Also skip 3.8 builds on 32 bit platforms

In the recently merged Qiskit#12910 the minimum Python version was raised to
3.9. As part of this the cibuildwheel config was updated to skip 38
uilds since they wont work anymore. However that PR missed that there
was an additional skip config in for the 32 bit builds in the job
definition. This commit adds the missing skip so the 32bit wheel builds
will work as well.

.github/workflows/wheels.yml

@@ -60,7 +60,7 @@ jobs:
       - name: Build wheels
         uses: pypa/[email protected]
         env:
-          CIBW_SKIP: 'pp* cp36-* cp37-* *musllinux* *amd64 *x86_64'
+          CIBW_SKIP: 'pp* cp36-* cp37-* cp38-* *musllinux* *amd64 *x86_64'
       - uses: actions/upload-artifact@v4
         with:
           path: ./wheelhouse/*.whl